Question

How to find the sum of a number/factorial of the number of all natural numbers from 1 to N in C

Answer 1

#include <stdio.h>

// 1/1! + 2/2! + 3/3! + 4/4! + ... N/N!
 
long factorial(long n) {
    return (n==1 || n==0) ? 1 : n * factorial(n - 1);
}

int main()
{
	long N = 7;
	float sum = 0.0f;

	for(int i = 0; i <= N; i++) {
		sum = sum + ((float)(i) / (float)(factorial(i)));
	}
	
	printf("Sum of the series is: %f", sum);
	
	return 0;
}
  
  
    
/*
run:
    
Sum of the series is: 2.718056
 
*/

 

70+ SQL courses for beginners and professionals